v3.26.1
Note 3 - Debt Securities Available for Sale and Held to Maturity - Schedule of Estimated Fair Value of Investment Securities Portfolio (Details) - USD ($)
$ in Thousands
Jun. 30, 2026
Dec. 31, 2025
Debt securities available for sale, amortized cost $ 3,806,125 $ 3,598,126
Debt securities available for sale, gross unrealized gains 277 2,081
Debt securities available for sale, gross unrealized losses (167,225) (131,473)
Debt securities available for sale 3,639,177 3,468,734
Held to Maturity, Amortized Cost 807,847 819,575
Held to Maturity, Gross Unrealized Gains 528 3,281
Held to Maturity, Gross Unrealized Losses (17,935) (10,276)
Held to Maturity, Fair Value 790,440 812,580
Total, amortized cost 4,613,972 4,417,701
Total, gross unrealized gains 805 5,362
Total, gross unrealized losses (185,160) (141,749)
Total, fair value 4,429,617 4,281,314
Agency Residential MBS [Member]    
Debt securities available for sale, amortized cost 178,726 194,394
Debt securities available for sale, gross unrealized gains 1 8
Debt securities available for sale, gross unrealized losses (11,712) (10,056)
Debt securities available for sale 167,015 184,346
Held to Maturity, Amortized Cost 38,873 43,734
Held to Maturity, Gross Unrealized Gains 19 26
Held to Maturity, Gross Unrealized Losses (2,388) (2,231)
Held to Maturity, Fair Value 36,504 41,529
Agency Commercial MBS [Member]    
Debt securities available for sale, amortized cost 1,152,186 709,371
Debt securities available for sale, gross unrealized gains 1 1,600
Debt securities available for sale, gross unrealized losses (21,372) (3,411)
Debt securities available for sale 1,130,815 707,560
Held to Maturity, Amortized Cost 19,329  
Held to Maturity, Gross Unrealized Gains 0  
Held to Maturity, Gross Unrealized Losses (78)  
Held to Maturity, Fair Value 19,251  
US Government Agencies Debt Securities [Member]    
Debt securities available for sale, amortized cost 308,276 309,079
Debt securities available for sale, gross unrealized gains 0 72
Debt securities available for sale, gross unrealized losses (11,745) (6,739)
Debt securities available for sale 296,531 302,412
US States and Political Subdivisions Debt Securities [Member]    
Debt securities available for sale, amortized cost 40,964 46,264
Debt securities available for sale, gross unrealized gains 7 1
Debt securities available for sale, gross unrealized losses (540) (543)
Debt securities available for sale 40,431 45,722
Held to Maturity, Amortized Cost 15,839 33,597
Held to Maturity, Gross Unrealized Gains 8 10
Held to Maturity, Gross Unrealized Losses (12) (36)
Held to Maturity, Fair Value 15,835 33,571
Corporate Debt Securities [Member]    
Debt securities available for sale, amortized cost 1,917,695 1,913,553
Debt securities available for sale, gross unrealized gains 5 0
Debt securities available for sale, gross unrealized losses (121,617) (109,473)
Debt securities available for sale 1,796,083 1,804,080
Held to Maturity, Amortized Cost 733,806 742,244
Held to Maturity, Gross Unrealized Gains 501 3,245
Held to Maturity, Gross Unrealized Losses (15,457) (8,009)
Held to Maturity, Fair Value 718,850 737,480
Collateralized Debt Obligations [Member]    
Debt securities available for sale, amortized cost 208,278 425,465
Debt securities available for sale, gross unrealized gains 263 400
Debt securities available for sale, gross unrealized losses (239) (1,251)
Debt securities available for sale $ 208,302 $ 424,614